Недавно делал быстрый прототип асинхронного приложения в котором требовалось вызывать много синхронного кода. Да, я знаю, что это не лучший дизайн, но нужно было быстрое решение на один процесс и без очередей. Поэтому я выполнял код в потоках.
Выглядело это примерно так:
from fastapi.concurrency import run_in_threadpool
async def execute(data: DataRequest) -> DataResponse:
try:
result = await run_in_threadpool(sync_function, data)
return DataResponse(data=result)
except Exception as e:
return DataResponse(
error=str(e),
success=False,
)
В общем работает нормально. Для всех вызовов под капотом используется общий тредпул, всё работает предсказуемо.
Но потребовалось изменить количество запускаемых в пуле потоков (по умолчанию создается 40 воркеров).
Так как дело происходит с FastAPI, делается это через lifespan используя настройки anyio:
import anyio
@asynccontextmanager
async def lifespan(app: FastAPI):
limiter = anyio.to_thread.current_default_thread_limiter()
limiter.total_tokens = 100
yield
# если вдруг нужно вернуть обратно
limiter.total_tokens = 40
Зачем менять количество воркеров?
- уменьшить, если оперативки мало (один тред занимает ~8мб)
- увеличить чтобы выдержать нагрузку
Если есть предложения получше при тех же вводных - предлагайте😉
#async
Business Center in Fukuoka, Japan.
OMA/Shohei Shigematsu's Tenjin Business Center in Fukuoka, Japan articulates the convergence of urban activity. By eroding the façade, the building carves out an entry plaza at the ground level and green terraces along the upper level offices.
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The winning proposal for Dock A at the internationally acclaimed Zurich airport.
The new Dock is comprised of solid local wood and answers the increasing complexity of our airports with the simplest possible response: a mass timber space frame that is structural design, spatial experience, architectural finish, and organizational principle in one.
Architecture: big, Hok Network, 10:8 architects, buro happold, timber experts Pirmin Jung and aviation consultant NACO.
Visualization: Bucharest.studio
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The Panda Pavilions.
Architect: EID Architecture.
Location: Chengdu, China
Area: 12,287 m2
Construction nearly completed,and pavilions will open to public in 2022.
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Wettingen railway station area.
Architecture: Schneider & Schneider Architects
Visual by OVI images
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Red Bull Headquarters in Leipzig, Germany.
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Visualization by Sora
Architecture: 3XN Architects
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Proposal for the new National Design Museum in Sejong.
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Architecture: STLarchitects
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Grand Tower.
Architecture by Werner Sobek.
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The circular form of World of Volvo.
Architecture by Henning Larsen.
Visualization by Kvant.1 and Henning Larsen
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